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this stack will help you learn the basics about atoms

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
        Help!  

Term
Definition
Atomic Number   Number of protons and electrons in an atom  
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Atomic Mass   total weight of protons and neutron (everything in the nucleus)  
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atom   smallest unit of matter  
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neutron   a subatomic particle that has no charge and that is found in the nucleus of an atom  
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proton   a subatomic particle that has a positive charge and that is found in the nucleus of an atom. Represented by the atomic number  
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electron   a subatomic particle that has a negative charge- found outside the nucleus  
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element   A pure substance made up of only one kind of atom  
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compound   a substance made up of atoms of two or more different elements joined by chemical bonds  
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mixture   a combination of two or more substances that are not chemically combined  
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molecule   a group of atoms bonded together  
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pure substance   a substance that cannot be separated by physical means; elements and compounds  
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homogeneous mixture   a mixture that is evenly mixed; also called a solution  
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precipitate   an insoluble substance that is produced as a result of a chemical reaction  
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heterogeneous mixture   a mixture that is unevenly mixed  
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